1999 GMC C-SERIES radio

yellowblue
2-45
When you turn the headlamp switch off, the regular
lamps will go off, and your low
-beam headlamps will
change to the reduced brightness of DRL.
To idle your vehicle with the DRL off, set the parking
brake. The DRL will stay off until you release the
parking brake.
As with any vehicle, you should turn on the regular
headlamp system when you need it.
Marker and Clearance Lamps Switch
(If Equipped)
Your vehicle will have this
switch only if it is designed
to pull a trailer. If it has this
switch, you'll find it on the
upper right side of your
instrument panel, just above
the radio.If your vehicle has no radio, the switch is just above the
storage area. Use the switch to operate your clearance
and marker lamps. The marker lamps are illuminated
when the indicator light is on.
Your headlamps switch will not operate these lamps.
You can use the switch to manually blink the marker and
clearance lamps by simply turning it on and off.
ProCarManuals.com

yellowblue
2-47 Heated Outside Mirrors (If Equipped)
If your vehicle has heated
mirrors, you'll find this
switch on the upper right
side of your instrument
panel area, just above the
radio. Use it to operate your
mirror heaters to defrost or
defog your mirrors.
When you turn on the mirror heaters, an indicator light
in the switch will be lit to tell you the heaters are on.
Once the mirrors are clear for viewing, turn the switch
off. The mirror heaters remain on until the heater switch
or ignition switch is turned off. However, when you turn
the ignition back on, the heater switch will again be on
until turned off.
Ashtray and Cigarette Lighter
(If Equipped)
The ashtray is just below the gages on the right side of
your instrument panel. If you have a cigarette lighter, it
is inside the ashtray.
To use the lighter, press it in all the way and let go.
When it's ready, it will pop back by itself.
NOTICE:
Don't hold a cigarette lighter in with your hand
while it is heating. If you do, it won't be able to
back away from the heating element when it's
ready. That can make it overheat, damaging the
lighter and heating element.
To remove the ashtray for cleaning, pull up on the
front of it.
ProCarManuals.com

yellowblue
2-48
NOTICE:
Don't put papers and other things that burn into
your ashtray. If you do, cigarettes or other
smoking materials could set them on fire,
causing damage.
Sun Visors
To block out glare, you can move the sun visors. You
can also swing them from side to side.
Auxiliary Power Jacks (If Equipped)
If your vehicle has these
power jacks, you'll find
them in the ashtray.These jacks provide 12
-volt power so you can operate
things such as a citizen's band (CB) radio or a cellular
phone. You'll see positive (red) and negative (black)
outlets. They have a 20
-amp fuse that is common with
the cigarette lighter. Don't use the cigarette lighter when
you're using a power jack because it may overload the
circuit and blow the fuse.
NOTICE:
Whether or not your vehicle has the power
outlets, don't plug in FM communications gear at
the ashtray area. FM equipment creates high
heat, and over time the area could get so hot that
wires could be damaged or a fire could even
break out.
ProCarManuals.com

yellowblue
2-56 Charging System Indicator Light
CAUTION:
If your vehicle has an electric/hydraulic parking
brake, do not drive if the charging system light is
on. If the battery drains too much, the parking
brake can suddenly come on and stop the vehicle.
This can cause severe injury to you and others.
The charging system light is
located in the center of the
instrument cluster just
above the odometer.
It should come on briefly when you turn on the ignition,
before the engine is running, as a check to show that it
is working.If it stays on, or comes on while you are driving, have it
checked right away. You could have a loose generator
drive belt or some other problem.
Driving while this light is on could drain your battery. If
you must drive a short distance with the light on, turn
off your radio and other accessories.
Sustained driving with a generator failure could result in
a lack of back
-up braking if the engine quits or the
power steering pump should fail.
Voltmeter
When your engine is
running, the voltmeter gage,
at the lower left of the
instrument cluster, shows
the charging system voltage.
Readings in either warning zone indicate a possible
problem in the electrical system.
ProCarManuals.com

yellowblue
2-57
Readings in the low warning zone may occur when a
large number of electrical accessories are operating
in the vehicle and the engine is left at an idle for an
extended period. This condition is normal since the
charging system may not be able to provide full
power at engine idle. As engine speeds are increased,
this condition should correct itself because higher
engine speeds allow the charging system to create
maximum power.
You can only drive a short time on the battery. Be sure
to shut off the radio, the fan or any unnecessary
accessories and have the system serviced.
Do Not Shift Warning Light
If your vehicle has the
Allison MD automatic
transmission, certain
transmission malfunctions
will turn this light on.If this light comes on while you are driving, do not use
the transmission shift control. Using the transmission
shift control will result in the loss of forward gears. The
computer for the transmission senses a problem and
chooses a gear to stay in so that you can drive the
vehicle in that gear. You may not be able to drive as fast
or back up when this light is on.
NOTICE:
If the DO NOT SHIFT warning light comes on
while you are driving, it is a warning that making
a transmission ªrangeº change could leave you
stranded. The vehicle may not continue to move
if you change gears with the transmission shift
control. The transmission can't operate in all
gears because something is wrong. Leave the shift
control alone and drive directly to a GM dealer
for service. If you can't go in for service
immediately, have the vehicle towed.
Brake System Warning Light
Your vehicle has either hydraulic or air brakes. Each
system has different warning lights.
ProCarManuals.com

3-
yellowblue
3-1
Section 3 Comfort Controls and Audio Systems
In this section, you'll find out how to operate the comfort control and audio systems offered with your vehicle.
Be sure to read about the particular systems supplied with your vehicle.
3
-2 Comfort Controls
3
-5 Air Conditioning
3
-5 Heating
3
-6 Defogging
3
-6 Ventilation System
3
-7 Audio Systems
3
-7 Setting the Clock3
-8 AM/FM Stereo
3
-10 Remote Cassette Tape Player (If Equipped)
3
-10 Understanding Radio Reception
3
-11 Tips About Your Audio System
3
-12 Care of Your Cassette Tape Player
3
-12 Fixed Mast Antenna
ProCarManuals.com

yellowblue
3-8 AM-FM Stereo
Playing the Radio
ON
-OFF: Press the round button to turn the radio on.
Press it again to turn the radio off.
VOLUME: Slide the VOLUME lever to the right to
increase volume or to the left to decrease volume.
CALL: Press this button to display the clock for
a few seconds when the radio is on. To change what is
normally shown on the display (station or time), press
this button and the SET button.Finding a Station
AM/FM: Press this button to switch between AM and
FM. The display shows your selection.
TUNE: Press UP to increase the frequency of a radio
station and DOWN to decrease the frequency of a radio
station. If you press and hold the UP or DOWN button
for more than half a second, the radio will tune rapidly
in that direction.
SEEK: Press SEEK to tune the radio to the next higher
station and stay there.
SCAN: Press SCAN to listen to the next higher
radio station for a few seconds. Press SCAN again
to stop scanning.
PUSHBUTTONS: The six numbered pushbuttons
let you return to your favorite stations. You can set up to
12 stations (six AM and six FM). Just:
1. Turn the radio on.
2. Press AM/FM to select a band.
3. Tune in the desired station.
4. Press SET. (SET will appear on the display and will
blink for about eight seconds.)
ProCarManuals.com

yellowblue
3-9
5. Press one of the six pushbuttons within eight
seconds. In the display, SET will stop blinking
indicating the preset is set. Whenever you press that
numbered button, the station you set will return.
6. Repeat the steps for each pushbutton.
Also, you can use the automatic memory SET button
to set the pushbuttons. You can set up to 12 stations
(six AM and six FM). Just:
1. Press AM/FM to select a band.
2. Press and hold SET. (SET will appear on the display
and will blink.)
3. While pressing the SET button, press the SEEK
button. Release both switches. The radio will
automatically search the band and select radio
stations, up to six, which have good signal strength.Setting the Tone
BAS: Slide this lever left or right to decrease or increase
the bass.
TRE: Slide this lever left or right to decrease or
increase the treble. If a station is weak or noisy, you may
want to decrease the treble.
LOUD: To increase bass and treble at low volumes,
press this button. LOUD will appear in the display. Press
this button again to turn LOUD off.
Adjusting the Speakers
BAL: Slide this lever to the left or right to adjust
the speaker balance between the left and right speakers.
The middle position balances the sound between
the speakers.
FAD: Slide this lever to the left or right to adjust
the speaker balance between the front and rear speakers.
The middle position balances the sound between
the speakers.
ProCarManuals.com